Crypt Ghast (Gatecrash)

Card Text: Extort (Whenever you cast a spell, you may pay w/b. If you do, each opponent loses 1 life and you gain that much life.)Whenever you tap a Swamp for mana, add B to your mana pool (in addition to the mana the land produces).

Oracle Text: Extort (Whenever you cast a spell, you may pay W/B. If you do, each opponent loses 1 life and you gain that much life.)Whenever you tap a Swamp for mana, add an additional B.